<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../../assets/blog_header.png" alt="" />
      </div>
      <!-- 登录表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" placeholder="输入用户名" prefix-icon="el-icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" placeholder="输入密码" prefix-icon="el-icon-lock" type="password" @keydown.enter.native="login"></el-input>
        </el-form-item>
        <!-- 按钮区 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
          <el-link type="primary" @click="$router.push('./Main')">返回首页</el-link>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 表单数据绑定
      loginForm: {
        username: 'admin',
        password: 'cxyCXY@123@'
      },
      // 表单验证规则
      loginFormRules: {
        // 验证用户名
        username: [
          { required: true, message: '请输入用户名称', trigger: 'blur' },
          { min: 2, max: 8, message: '长度在 2 到 8 个字符', trigger: 'blur' }
        ],
        // 验证密码
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置表单
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    // 登录表单验证，valid 等于true时验证通过
    login() {
      this.$refs.loginFormRef.validate(valid => {
        if (!valid) return
        this.$http.post('login.php', this.loginForm).then(res => {
          if (res.data.result.status !== 1) return this.$message.error('登录失败')
          this.$message.success('登录成功')
          // 1.登录成功之后的 token 保存到 客户端 的 sessionStorage 中
          // 1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
          // 1.2 token 之应在当前网站打开期间生效，所以将token保存在 sessionStorage 中
            window.sessionStorage.setItem('blogs_check_token',res.data.result.token);
            window.sessionStorage.setItem('username',this.loginForm.username);
          // 跳转网页
          this.$router.push('/Admin')
        })
      })
    }
  }
}
</script>

<style scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.login_box .avatar_box {
  width: 130px;
  height: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
}
.login_box .avatar_box img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #d6d9db;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 15px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.el-link {
  position: absolute;
  left: -250px;
  font-size: 12px;
}

/* 移动端 */
@media screen and (max-width: 639px) {
  .login_container {
    display: inline-flex;
    width: 100%;
    height: 100%;
  }
  .login_box {
    width: 100%;
  }
  .el-link {
    position: absolute;
    left: -200px;
    font-size: 12px;
  }
}

</style>
